Reconstruction of flood events in an oxbow lake (Marótzugi-Holt-Tisza, NE Hungary) by using subfossil cladoceran remains and sediments

János Korponai, István Gyulai, M. Braun, Csilla Kövér, István Papp, László Forró

Research output: Article

3 Citations (Scopus)

Abstract

Oxbow lakes are important components of the floodplain systems of lowland rivers. During flood events, oxbows are connected with the main river channel, and behave as lotic systems, while during inter-flood periods, these lakes can be considered as lentic ecosystems. Rivers are generally poor in planktonic organisms and their sediments contain scarce biological remains in comparison to lentic water ecosystems. However, due to their alternating running and standing water regime, sedimentary biological remains of oxbow lakes can be used as proxies for tracking changes of past hydrological regimes. In this study we investigated how cladoceran communities respond to flood events, and whether flood events can be recognized by community analysis of cladoceran remains. A sediment core from Marotzugi-Holt-Tisza oxbow lake was analyzed for identification of past flood events based on changes in the subfossil Cladocera community. Floods were defined based on the proportion of fine sand (50 μm grain size) in the oxbow sediments. If the fine sand portion was <3%, the water regime of the oxbow was considered as lentic, otherwise it was lotic. Both organic and pigment contents were significantly higher in the core sections deposited during lentic stages. Thirty-four Cladocera species were determined in this core, all common to littoral habitats of eutrophic shallow lakes in Hungary. One planktonic (Bosmina longirostris) and four chydorid species (Alona rectangula, Acroperus harpae, Alonella nana and Chydorus sphaericus) were dominant throughout the core and contributed >90% of total remains. Discriminant analysis on cladoceran data confirmed that lotic and lentic hydrological stages were characterized by different Cladocera species associations. Bosmina longirostris, Chydorus sphaericus, Alona rectangula, Acroperus harpae, Leydigia leydigi, A. quadrangularis and A. nana were mainly responsible for the differences between lotic and lentic species assemblages. Our results revealed that Cladocera remains can be used to track changes in the hydrological regime of oxbow lakes.

Original languageEnglish
Pages (from-to)131-141
Number of pages11
JournalAdvances in Oceanography and Limnology
Volume7
Issue number2
DOIs
Publication statusPublished - jan. 1 2016

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oxbow lakes
oxbow lake
subfossil
Hungary
sediments
sediment
lentic systems
hydrological regime
rivers
sand
lotic systems
ecosystem
river channel
discriminant analysis
river
floodplains
sediment core
floodplain
lowlands
grain size

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Cite this

Reconstruction of flood events in an oxbow lake (Marótzugi-Holt-Tisza, NE Hungary) by using subfossil cladoceran remains and sediments. / Korponai, János; Gyulai, István; Braun, M.; Kövér, Csilla; Papp, István; Forró, László.

In: Advances in Oceanography and Limnology, Vol. 7, No. 2, 01.01.2016, p. 131-141.

Research output: Article

Korponai, János ; Gyulai, István ; Braun, M. ; Kövér, Csilla ; Papp, István ; Forró, László. / Reconstruction of flood events in an oxbow lake (Marótzugi-Holt-Tisza, NE Hungary) by using subfossil cladoceran remains and sediments. In: Advances in Oceanography and Limnology. 2016 ; Vol. 7, No. 2. pp. 131-141.
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